Sound-reproducing machine or phonograph



D. H, WI'KSON: scum) REPRODUCING MACHINE 0R PHONOGRAPH.

APPLICATION FILED HAY 6, I920.

PATENT OFFICE.

DAVID H. WILSON, OF PHILADELPHIA, PENNSYLVANIA.

SOUND-REPRODUCING MACHINE OR PHONOGRAPI-I.

Application filed May 6, 1920.

To all whom it may concern:

Be it known that 1, DAVID H. lVILsoN, a citizen of the United States of limerica residing at 6051 Trinity street, city of Phila delphia, in the county of lhiladelphla and State of Pennsylvania, have invented cer train new and useful Improvements in Sound-Reproducing Machines or Phonographs, of which the following is a specificatlon.

This invention relates to sound reproducing machines or phonographs. More particularly the invention relates to improvements in the tone chamber or horn of such instruments.

One important object of the invention is to provide, in a cabinet phonograph, an improved form of mounting for the tone chamber so arranged as to give greatly increased volume, clearness and brilliancy of tone.

A second important object of the invention is to provide, in a cabinet phonograph. an improved mounting for the tone chamber which is so arranged as to eliminate the damping of the tone chamber vibrations by the cabinet or casing, the tone chamber being free to vibrate independently of such casing.

A third important object of the invention is the provision of an improved form of tone chamber capable of being molded in a sin gle piece or made from a number of pieces separate from the cabinet and, after being so made, assembled in its cabinet.

WVith the above and other objects in view, as will be hereinafter apparent, the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawings and specifically claimed.

In the accompanying drawings like characters of reference indicate like parts in the several views, and

Figure 1 is a perspective view of a cabinet phonograph constructed in accordance with this invention.

Fig. 2 is a horizontal section through the upper part of the casing of a phonograph constructed in accordance with this invention, the view being taken to show the tone chamber in position.

Fig. 8 is a vertical section on the line 3-3 of Fig. 2.

Fig. 4 is a side view of the tone chamber, showing the manner of supporting the same.

Specification of Letters latent.

Patented Dec. 28, 1920.

Serial No. 379,218.

Fig. 5 is a bottom or under side View of a lock plate used herewith.

In the embodiment of the invention herein illustrated there is disclosed a phonograph having a casing 10 in the upper part of which is provided space for a tone chamber or horn 11. This tone chamber is made of any desired shape and constructed in one or more pieces. hen made in a single piece it may be molded from rubber, glass, metal or other suitable material; it may be turned or spun to shape from a single piece of material or from layers of one or more materials, as wood, or it may be built up. In any event, it is provided with flanges 12 extending outwardly from the body. These flanges are provided with pockets or sockets 13 on each side and intermediate said pockets are screw or bolt holes 14. EX- tending inward from the sides of the casing 10 are ledges 15 also having pockets 16 arranged opposite the pockets on the under side of the flanges 12. Held in the pockets 123 and 16 are balls 17 and similar balls 18 are mounted in the pockets 13 in the upper sides of the flanges 12. At 19 are shown lock plates which are provided on their under sides with pockets 20 to receive the balls 18, and these plates are held in position by screws 21 which pass through the lock plates and loosely through the openings 1 into the ledges 15. It is to be noted that the flanges 15 do not touch the casing 10, but are free therefrom.

By the method of construction as shown and described the tone chamber is supported between the balls 17 and 18, such balls being arranged for slight movement within their respective pockets. This increases the elasticity and vibratory characteristics of the tone chamber and thus increases its etiiciency and insures its satisfactory action. Moreover, the softer vibrations of the tone chamber, when the latter is of wood or the like, blend with the metallic vibrations of the ball bearings, thereby giving a brilliancy to the tones produced in the tone chamber. Furthermore, by supporting the tone chamber upon balls only a small contact is secured; that is, it is only supported at intervals and consequently greater elasticity and responsiveness are secured.

Having thus described the invention, what is claimed as new is:

1. In a phonograph, a casing, a tone chamber having flanges projecting there Cji from longitudinally thereof, and ball bearings supported from the casing and supporting said flanges.

2.1n a phonograph, a casing, a tone chamber having flanges projecting therefrom longitudinally thereof, ledges projecting from the casing in spaced relation to the flanges, and balls interposed between the ledges and flanges.

3. In a phonograph, a casing, a tone chamber within but free from the casing, flanges projecting laterally from the tone chamber and extending longitudinally there of, and spaced supports supported from the casing and on which the flanges rest.

4. In a phonograph, a casing, a tone chamber within but free from the casing, flanges projecting laterally from the tone chamber and extending longitudinally thereof, and balls supported by the casing and on which the flanges rest, said flanges being provided with seats for said balls.

5. In a phonograph, a casing, a tone chamber within but free from the casing, flanges projecting laterally from the tone chamber and extending longitudinally thereof, ledges extending inwardly from the sides of the casing beneath and in spaced relation to the flanges, balls between the flanges and ledges, other balls resting on the flanges, lock plates on the last mentioned balls, and screws passing through the lock plates and loosely through the flanges into the ledges.

6. In a phonograph, a casing, a tone chamber within but free from tne casing, flanges projecting laterally from the tone chamber and extending longitudinally thereof, ledges extending inwardly from the sides of the casing beneath and in spaced relation to the flanges, balls between the flanges and ledges, other balls resting on the flanges, lock plates on the last mentioned balls, and screws passing through the lock plates and loosely through the flanges into the ledges, said ledges, flanges and lock plates being provided with opposed seats for said balls.

In testimony whereof I have affixed my signature.

DAVID E. WILSON. 

